Refrigeration



5 Sheets-Sheet 1 I I I E I nnmnnnunj Illlll II IIIIIIIIIIIIIII III III

lllIIlIll C. c. COONS nmmrenmnon' Filed April 2, 1941 l I l l I I I IIIIIIIIIIIIIIII I l I I l I I I :IIIIII llllllII IIIIII II I 1TIIIIIIIIII IIIIIII IIIllllII Aug. 31, 1 943.

7 nw wmn 1 Il IIIII IIIIIIIIIII IIllllIlIlllIlll INVENTOR Curtis6.600128 BY ll IIIIIIIIIHHHHH I IIII llllllllllllllll g- 1943 c. c.COONS 2,328,195

REFRIGERATION Filed April 2, 1941 5 Sheets-Sheet 2 INVENTOR Curtis 0.Coons M I W ATTORNEY Aug. 31, 1943. c c, oons 2,328,195 v REFRIGERATION"Fiied April 2, 1941 5 Sheets-She et s lNV ENTOR Curtis 0. CoonsATTORNEY Aug. 31, 1943. c. c. COONS I REFRIGERATION Filed April 2, 19415 Sheets-Sheet 4 INVENTOR Curtis C. Coons BY I ATTORNEY Aug. 31, 1943.c. C. cooNs 2,328,195

REFRIGERATION Filed April 2, 1941 5 Sheets-Sheet 5 53 7 INVENTOR' Curtis0. Coons Patented Aug. 31, 1943 2,328,195 aEFnrGEaArroN Curtis 0. Coons,North Canton, Ohio, assignor to The Hoover. Company, North Canton, OhioApplicationAprilZ, 1941, Serial No. 386,394

I {In Great Britain August 20, 1937 351Claims; (01. 62-1195) 1 inventionrelates to l absorption refrigcrating systems and morelparticularlytoevaporator structures designed for use in suchsystems.-

This application isa continuation-impart of my application Serial No.220,186, filed July 20,

1938. M Heretofore, ,evaporators designed: for use in absorptionrefrigerating systems and particulari 1y those designed for use in threefluid absorption refrigerating systems were of the gravity type; thatis, the liquidrefrigerant was supplied 7 to the top portion of theevaporator andflowed continually downwardlyj therethrough by gravity andin contact with'a pressure equalizing medium. These evaporatorshad thedisadvantage that the sole propelling force operable tomove the liquidwas the force of gravity; andpthey did not relate the rates of gas andliquidflow through the evaporator In the continuous passage typeevaporator, a type almost universally used in idomestic installations,the evaporator was liable to be blocked with liquidrefrigerant iftherefrigerating cabinet was set up in a slightly inciined position dueto inaccuracies in manufacture or to imperfections in the supportingsur; face. This caused eithencomplete blockage of the evaporator or theundesirable accumulation of quantities of liquid refrigerant inlowportions of theevaporator coil which seriously interfered with thefree flowlof inert gas through the evaporator even if they-did not.completely block such flow.

I havediscovered that a propelled stream of pressure equalizing medium,preferably a dense inert gas such as nitrogen, can be utilized to sweepor drag the liquid refrigerant through the horizontal or substantiallyhorizontal portions of the evaporator whereby the flow of liquidrefrigerant through the evaporator isproportional to. the rate of flowof the pressure .equalizingmedium and blockage of the gaspath iseffectively prevented. e e

More specifically, I have devised an evaporator in which the generaldirectionofflow of the liquid refrigerant therethroughiis downwardly andthe general direction of flow of the inert gas therethrough isupwardlybut in which the gas and liquid flow in parallel relationship atall points of gas and liquid contact.

I have also provided an evaporator structure wherein the liquidrefrigerant is supplied to an intermediate elevation thereof and iswholly or partly elevated into the top thereof by meansof a gas liftpump. This is a very advantageous constructionfor the reason that sp'acelimitations in domestic refrigerating cabinets are sharply limited andit is highly desirable to place the evaporaterin the very top portion ofthe food storage compartment. v If the liquid refrigerant discharged by.the condenser can be supplied to the evaporator .belowthe top thereof,the con densercan be extended or lowered'with respect to therefrigeration cabinet and the evaporator can be raised to the topportion ofthefocd storage compartment. 3

The design and arrangement of previous threefluid absorptionrefrigerating machines is involved by the necessity for continuouslysloping the evaporator conduit or passagewayfrom one end to the otherthereof in order to proyide for flow of the liquid refrigerantby'gravity. This is further complicated by the fact that it isimpossibleto insure absolute leveling of the apparatus either in. manufacture orin installation. The slope of the evaporator conduits must be such as toinsure a proper flow of liquid even though the evaporator be set inaninclined position both in the manufacture of the machine and in theinstallation thereof in a household. Due to the necessity for slopingtheconduits previousmachinescould not be designed so as to place the icefreezing trays in direct heat transfer relationship with the conduit orgas and liquid passageway forming means of the evaporator. The priorpractice is to form the evaporator of a heavy cast ing with continuouslysloped passageways inthe sides and back thereof in order to insure flowof the liquid refrigerant by gravity. :The heat which is tobe abstractedfrom the ice trays must then be conducted from the shelf upon which thetray rests to the side walls of the. evaporator casing and then to theevaporator passageway. This seriously impairs the efficiency of presentthreefluid absorption machines and also causes them to be unusually slowice freezers.

In prior constructions the amount of coil which can be arranged in arestricted vertical plane is limited as it is not feasible to extend thevertical dimension of the evaporator because this would render alargepart of thestorage chamber useless. Another limiting factor (inprior constructions arises from the fact that heat must be conductedfrom the bottom of the freezing. tray laterally through the traysupporting shelf to the side walls of the evaporator; This precludes anevaporator construction in which more than one ice tray is positionedatanyjgiven positioned side by side.

By placing the passageways in the side and back walls of the evaporatorcasing the heat transfer path between the air in the storage compartmentand the evaporating liquid refrigerant is much better than the heattransfer passageway path between the ice freezing trays and theevaporating liquid refrigerant. Those portions of the evaporatorpassageways connecting vertically spaced parts of prior evaporatorsproduce refrigoration which is substantially useless for ice productionbecause of the long heat transfer path between the ice trays and theconnecting parts of the passageway. Therefore, in previous machines agreat quantity of frost is collected on the very cold side walls of theevaporator and foodstuffs in the storage compartment are unduly driedout. v Previous three-fluid refrigerating machines are normally providedwith an upper conduit which carries a number of fins for the purpose ofcooling the air within the storage compartment. However, this element isnormally effective only under very severe conditions 'as'the demand ofice freezing must always be met and by far the greater part of the aircooling load is carried by the walls of the freezing chamber and thefinned c'onduit'serves only as a peak load cooling unit.

It is accordingly a principal object of this invention to provide anevaporator construction useful in a three-fluid absorption refrigeratingmachine in which the ice trays may rest directly upon the evaporatorconduits and in which inacship with ice trays in counterflowrelationship with the inert gas stream.

It is another object of the invention to provide an evaporator forthree-fluid absorption refrigerating systems in which the length of theevapcrating passageway may be as great as desired, the evaporatingpassageway may be arranged in direct heat conducting relationship withth ice trays, there is no need to make thevertical dimensions of theevaporator excessive, and a plurality of ice trays may be positionedside by side at the same elevation without impairing the efficiency ofthe apparatus or increasing the time required to freeze ice.

It is a further object of the invention to provide an absorptionrefrigerating machine so constructed and arranged that the ice freezingportions thereof may be arranged in direct heat curacies in manufactureand inclination of the machine encountered in installation'of the samewill in no wise affect the operativeness of the apparatus or the flow ofliquid refrigerant therethrough.

It is a further object of the present invention to provide an evaporatorfor three fluid absorption refrigerating machines in whichthe evaporatordirectly underlies the ice trays and is thermally remote from the sidewalls of the refrigerating chamber;

It is another object of the invention to provide an evaporator forthree-fluid absorption refrigerating systems in which substantially'allthe refrigerating effect at low temperatures occurs in the horizontalevaporator passageway underlying the freezing receptacles and in whichsubstantially no refrigerant is produced in the passageways connectingvertically spaced parts of the evaporator.

It is a further object of the present invention to provide a three-fluidabsorption refrigerating machine in which the evaporator is soconstructed and arranged that the ice freezing'portions thereof are inthe most direct and intimate possible heat transfer relationship withthe ice freezing trays, are thermally remote from the'air circulating inthe storage chamber and in which the air cooling load is carrieddirectly by an air cooling element. I

It is another object of the invention to provide an evaporator forthree-fluidabsorption refrigerating machines in which the actualevaporator conduits are "concealed and are so positioned that theevaporator may be styled as desired.

It is'a further object of the present invention to provide an evaporatorconstruction in which the liquid refrigerant flows first through an aircooling element, then through 'a'cooling element which serves directlyto refrigerate a removable storage drawer for meat and the like andindirctly to refrigerate ice trays and then flows through a path indirect heat transfer relationconducting relationship with the ice traysand in which'the air cooling portions thereof are arranged effectivelyto refrigerate the air within the storage compartment withoutsubstantial blockage of air flow thereover by the ice freezing portionsof the evaporator.

Other and more specific objects of my invention will become apparent asthe description proceeds when taken in connection withthe accompanyingdrawings in which:

Figure 1 is a diagrammatic representation of the refrigerating systemembodying my invention;

Figure 2 is a detailed perspective view showing one form of myevaporator;

Figure 3 is another detailed perspective view showing a secondform of myevaporator; and

Figure 4 is another detailed perspective view showing a third form of myevaporator.

Figurev5 is a perspective View of another form of the evaporator.

Figure 6 is a partial front elevational view in section showing the formof the evaporator illustrated in Figure 5 installed in a cabinet, and

Figure '7 is a side elevational view of the apparatus shown in Figure 6.

Referring now to the drawings in detail and first to Figure 3. thereof,it will be seen that I have illustrated a continuous three fluidabsorption refrigerating system comprising boiler 'B, an analyzer D, arectifier R, a condenser C, an evaporator E, an absorber A, and acirculating fan F operated by an electric motor 'M. The elements justenumerated are suitably connected to form a complete refrigeratingsystem including a number of local gas and liquid circuits. It will i beunderstood that the system is suitably charged with a refrigerant suchas ammonia, an absorbent such as water, and a pressure equalizingmedium, preferably a dense inert gas such as nitrogen.

The boiler 13 is heated by any suitable means such as a gas burner or anelectric cartridge heater. The circulating fan motor M and the heaterfor the boiler B are controlled in any suitable or desired manner.Preferably these elements are periodically energized to produce reafrigeration under the control of any suitable con- ];strong solutionflowing downwardly in the analyzer D whereby substantially purerefrigerant which may becarried into the-analyzer Dare condensed thereinand the heat of condensation serves to liberate morerefrigerant .vaporfrom the vapor is discharged from'the analyzer D into the top portion ofthe condenser C througha conduit II. The conduit H includes arectifierR, preferably of the air cooled type, which functions to causecondensation of any absorbent vaporwhich may pass through theanalyzer D.The condenser C is preferably a tubular finned air cooled type andserves to liquefy therefrigerant vapor by heatexchange with the ambientair. i

p The generation of refrigerant vapor in the boiler Bweakens thesolution therein which weak solutionis withdrawn through a conduit l2,liquid heat exchanger l3, and conduit l4 into the top solution flowsdownwardly through the absorber A by gravity in counterfiow to arefrigerant vapor inert gas mixture flowing upwardly therethrough andsupplied from a sourceto be described hereinafter. Strong solutionformed in the absorber Ais discharged therefrom through a conduit I5 isfinally drained into the lowest conduit 26 adjacentits point of;connectionwith the gas supply portion of the absorber A which ispreferablycf the finned tubular air cooled typeJjThe weak into asolution reservoir IS. The strong solution is conveyed from thereservoir it through a conduit |l,liqui,d heat exchanger "Luanda conduit18" into theupper portion of the analyzer D.

, The absorber A and the evaporator E are connected to form a pressureequalizing medium circuit. A rich gas conduitll connects the topportionof the evaporator with the bottom portionof the absorber. The.lean gas formed in the 3b sorber A exits from the top portion thereofthrough a conduit 22 into the suction inlet of the circulating ran F.The lean gas is placed under pressure by the fan F andis dischargedtherefrom through a conduit 23, gas heat exchanger 24, and a conduit25jinto the bottom of the evaporator E. The conduit 2| the gas heatexchanger 24. e v

It will he noted that the junction-of the corn duits and 2.2 isappreciably higher than the boiler analyzing system whereby the liquidmust also passes through be elevated or pumped through the conduit I4.For this purpose a bleed-off conduit 34 is connected between thedischarge conduit 23 of the fan and the conduit 14 below the liquidlevel in the boiler analyzing system whereby the weak solution inqtheconduit [4 is elevated into the top portion of the absorber Acby gaslift action It will be seen from the description above that the inertgas travels continuously through the evaporator E fromthe bottom to thetop thereof.

The evaporator E is diagrammatically illustrated as comprising a seriesof horizontal conduit sections 25 connected by riser conduits 21. Thetop riser conduit 21 open into an enlarged finned box-cooling conduit 28to the forward end of which is connected the rich gas conduit 2|. Liquidrefrigerant isconveyed from the condenser C to the rear end of theconduit 28 by means of aconduit29. The liquidflows throughthe conduit 28by gravity in the direction of flow of the inert gas stream to theforward end thereof from which point it is drained by aconduit30including a liquid trap into the forward end of the top conduit 26. Asmall dam 3l-is formed in the top conduit 26 to prevent liquidrefrigerant from flowing downwardly into the adjacent riser conduit 21.The liquid supplied to the top conduit 16 flows rearwardly'thereof underthe impetus of the propelled stream of inert gas supplied from duits.

conduit; 25; Anyliquidurefrigerant or foreign matternot evaporated inthe various portionsof the evaporator is drained therefromthrough aconduit 33 to the strong solutionreturn line I l.

- The'gas"conduits 21 and theliquid conduits 30 and if; While part ofthe evaporator structure in stood that-they may be constructed in anydesired specificform.

Froin thedescription above it will beseenthat theliquid refrigerantflows continuously downwardly through the evaporator and that the inertgas flows continuously' upwardly 'therethrough but that the g s andliquid travel in'parallel identical paths whereverthey are in contactand that the liquid is propelled or carried along by theinert gas streamexcept at such times as it is falling through a substantially verticalgas sealed drainconduit. v Referring now to Figure 2 wherein isillustrated a specific form ofmy evaporator, itwill be seen that I havegiven the'gas inlet and outlet con duits, the liquidlrefrigerant supplyconduit, and the drain conduit thesame reference characters as thoseapplied to corresponding elements in Figurel It isto be understood thatthe evapo rator of Figure 2 isdesignedto be usecl in a sysparallelseries ofhorizontal coil sections, 4|

and 42 which are serially connected by riser con duits 43 and. The topcoil section 42 is con: nected to the rearend of afinned box-coolingconduit 54 byimeans' of a riser conduit 45. Each coil section comprisesfour spaced parallel con- The outer conduits 46 and 41 of each'coilsection areserially connectedby transverse'con duits 48 extending acrossthe rear of the evaporator. The inner conduits the evaporator-to theadjacent outer conduits 46 and 41,

to the inner conduit 49 of the lowest coil section, and theother innerconduittfl of the lowestt coil section communicates through thelriserconduit 43 with the superposed inner conduit or the central coil section4|. the central coil section 4| communicates with the superposed innerconduit of the top coil section 42 through the riser conduit 44. Theother inner conduit or the top coil section 42 communicates withthebox-cooling conduit through the riser conduit 45. In this thebox-cooling coil 49 and 50 01 each coil section are-serially connectedacrossthe frontof respectively, whereby the inner conduits form theinlet and outlet connections of each coil section. The gas supplyconduit25 is connected The other inner conduit of embodiment of the inventionis sloped slightly downwardiacent the riser conduit 45. The drainconduit 52 including a U -shaped liquid seal portion connects the outletof the coil section 42 into the inlet .of the central coil section 4!.In like manner the center coil :sectionAl is drained into .the bottomcoil section to adjacent the gas inlet connection thereto. A small dam53 is provided adjacent the outlet of each drain conduit whereby toprevent liquid refrigerant from flowing downwar-dly through theadg'acent riser conduit. The drain conduit 33 is connected to the bottomcoil adjacent its connection with the riser conduit.

In this evaporator the liquid refrigerant flows in .counterfiowrelationship with the inert gasin the box-cooling conduit and isthen-drained to the inlet of the subjacen-t coil section through whichit travels in parallel flow-relationship-with the inert gas and underthe impetus thereof. The liquid refrigerant is then drained from theoutlet of one coil to the inlet of the subjacent coil entirely throughthe evaporator coil structure. While only three coil sections have beenillustrated, it will be understood that more or less may beprovided asdesired.

The vaporator illustrated in Figure 2 is well adapted to be enclosed ina sheet metal casing whereby the coil sections 40 and 4| form shelveswhich are adapted to receive ice-freezing trays.

Referring now to Figure 3 there is shown .another form of my evaporator.The gas inlet and outlet conduits, the liquid refrigerant conduits,

and the drain conduit are given the samereference characters ascorresponding parts in the refrigerating system'illustrate'd in FigureLand it is to be understood that this evaporator is adapted to be usedin a refrigerating system such as that disclosed in Figure 1.

This form of my evaporator comprises a continuous coil seriallyconnected to the frontend of an enlarged boX-cooling-conduitfil "Thecoil 69 comprises a series .of vertically spaced horizontal parallelU-shaped coil sections. One leg of each coil section is connected bymeans of .a riser conduit to the superposed coil section and theotherleg is connected "by means of a riser conduit to the subjacent coilsection. -The gas inlet 25 communicates with the front end of one leg ofthe lowest coil section "62 and the drain conduit '33 communicates withthe forward or dischargeend of the other leg of the lowest coil section62. The gas outlet conduit 2| and. the refrigerant liquid inlet conduit29 are connected to the rear end of thebox-cooling conduit 'Bl wherebythe liquid refrigerant flows through this conduit in counterflowrelationship with the inert gas stream. The liquid refrigerant isdrained from the front end of the conduit 6i into the gas inlet leg ofthe subjacent U-shaped vcoil section by means of a drain .conduit 63which includes a U -shaped liquid sealing trap. The gas outlet leg ofthe top .U.-.shape d coil section is trapped the liquid refrigeranttravels through the boxcooling coil by gravity in counterflowrelationship with the inert gas stream and that it thereafter travels inparallel relationship with and under the influence of the inert gasstream at all points at which'the gas and liquid are in contact. Theliquid is progressively drained from level to level through theevaporator coil out of contact with the gasstream,

The evaporator just described is well adapted to receive ice-freezingtrays therein or to be formed as a part of a metal evaporator structureincluding tray supporting shelves.

Referring now to Figure 4, it will be seen that I have illustrated.still another form of my evaporator. The,,.evapor,ator in Figure 4 isadapted to be utilized in structures wherein it is desirable to placethe evaporator at the highest permissible level in the food storagecompartment. This evaporator isdesigned to be utilized in arefrigeration system such as that disclosed in Figure 1. And to this endthe gas outlet, and liquid inlet conduits, the circulating fan andmotor, the fan supply and discharge conduits, and the condenser aregiventhe same reference characters as corresponding parts in'Figure l.

The evaporator disclosed in Figure 4 is identical with that disclosed.in Figure .3 .eXceptHin the following respects. The liquid inletconduit 29 is connected to the centerof the bight por tion l! of the topU-shaped coil section. A gas lift pump conduit l2 including a bottomU-shaped portion 73 is connected between the'conduit H and the rear endof the box-cooling conduit i4. A gas bleed-off conduit 15 is connectedbetween the gas discharge conduit 23 of the fan F and the U-shaPedportion '13 of the conduit i2 below the level of theconduit l l wherebyliquid refrigerant flowing into the U-shaped portion 13 is elevated intothe rear end of the box-cooling conduit M by gas lift action. Liquidrefrigeration not evaporated. in the conduit '54 is drained therefromthrough'a conduit "Hi corresponding to the conduit 63 described inconnection with Figure 3. The liquid refri erant is progressivelydrained'from level to level through the evaporator in the identicalmanner described in connection with Figure 3.

All or only a part of the liquid refrigerant may .be elevated into thebox-cooling conduit T l. Though only a single gas lift pump has beenshownit .is to be understood that the liquid refrigerant may be suppliedto any level of the evaporator and elevated to the top thereof by one ormore gas liftipump's.

The evaporator just described permits theboxcooling coil to bepositioned above the bottom of the condenser whereby the evaporator as aWhole may be positioned at a high elevation in the food storagecompartment.

In Figure 5 there is "illustrated another modified form of theinvention, particularly designed for use in a refrigerator cabinet inwhich it is Thisevaporator is substantially. identical with; theevaporator disclosed'and described in connection with Figure 2 except.in the respects noted specifically below. Thesame referencecharactersprimed have been used to denote those portions of the evaporator whichare identicalwith the evaporator of Figure 2. In this connection the twolowermost coil sections 49 and 4| and their respective connections tothe inertgascircult drain andinterconnections between them selves areidentical with the coil section 49 and 4| of Figure .2. The uppermostcoil sections 80 of Figure 5 contain the elements .46 and 49 which areidentical with the elements 49 and-l9 of the uppermost coilsectlon ofFigure 2 However, the conduit 46 communicates with an inner conduit .8|of the coil 8911337 means of a rear conduit 82 directly overlying the;rear conduit 48. .Thezconduit 8| at its front connects to the rearwardlyextending outer right hand conduit 83 which in turn communicates througha conduit 84 with an inclined sinuous enlarged diameter conduit 85 whichforms a box-cooling coil positioned laterally ofthe ice freezingcoilswhich are indicated generally at 86. The conduit 85 is ofenlargeddiameter with respect to the conduits forming the ice freezingevaporator 86 and is continuously sloped downwardly in order to provide.for gravity flow ofliquid refrigerant therethrough.

The outer endof the conduit 85 communicates at. 2| with: the rich inertgas discharge conduit and liquid refrigerant is supplied adjacent theconnection of the conduit 2| through the liquid refrigerant supplyconduit 29 which, as will be explained hereinbelow, connects to thecondenser C.

Itwill be understood that this'evaporator is designed and intended to beutilized in connection withthe refrigerating systemdisclosed in Figure 1and that the conduits 25, 33, 2| and 29 connect into the remainderof therefrigerating system in exactly the manner in which conduits bearing thesame numerals are connected into the systemin the apparatus shown inFigure1. Y

j The liquid refrigerant which flows through the conduit 8515drainedtherefrom through a U- shaped liquidseal conduit Blinto theconduit 49 "of the coil section adjacent its point of connection withthe riser conduit 44. l

disclosedin connection with Figure 2, the inert gas and'liquidrefrigerant-flow through the boxcooling conduit in counteriiowrelationship with the liquid refrigerant flowing under the influence ofgravity. In the horizontal ice freezing coils,

however; the liquid refrigerant fiows generally in counterflowrelationship with the inert gas through these coils considered as awhole. However, at all points of gas and liquid contact the 7 gas ,andliquid flows in the'same direction and. the liquid is circulated notbygravity but; by the inert gas itself.

Referring now to Figures 6 and 7, thearrangement of the evaporator ofFigure 5 in connection with a cabinetis illustrated. V

The apparatus will be provided with a suitable insulated cabinet 99which will be provided with an air cooling flue 9| extending along therear wall thereof. It will be understood that this cabinet will beprovidedwith a mechanism compartment underlying the refrigerated chamber92 which is enclosed Within the insulated cabinet 99. The generator,absorber and connecting conduits may be arranged in any desired mannerin this portion of the apparatus and the same will be provided withsuitable air openings to allow cooling air to circulate overthe'absorber and to flow upwardlythroughthe flue 9|.

As is shown in Figures 6 and 7, the ice freezing.

evaporator 86 is positioned in the upper left hand corner of thecompartment 92 and the air cooling conduits 95 project laterallytherefrom to the right. The condenser C is positioned in the upperportion of the flue 9| directly behind the evaporator. The gas heatexchanger 24 is also positioned in the flue 9| and connects to theevaporator by the conduits 2| and 25.

The rear wall of the cabinet 99 is provided with an opening 93 which isadapted to be sealed by an insulated closure element 96 and a sealinggasket 96. The'opening'99 is of such size that i the entire evaporatorassembly may be inserted A small dam ,98is provided at this point inorder to prevent liquid refrigerant from flowing down through th conduit44' in the event that the apparatus as installed should be tippedslightly. y

In this evaporator as in those discussed hereinabove the liquidrefrigerant flows through the box-cooling conduit 85fby gravity incounterflow relationship with the inert gas. After traversing theconduit 85 the liquid refrigerant is drained through the conduit 81 intothe coil section 89 through which it is circulated by the high veloc itystream of inert gas flowing therethrough and is then drained through theconduit 52' to'the subjacent coil section 4| through which it is againcirculated by the inertgas andis then drained from the coil section 4|through the conduit 5|f into the coil section 40 through which it isagain circulated by the inert gas and any residue material isthenconveyed through the conduit 33 tothe strong solution circuit.

'Cons eauently inethis evaporator like the one therethrough into thechamber 92, The liquid refrigerant supply conduit 29, the inert gasconduits. 2| and 25 and drain conduit 33 all pass through the closureelement 94. H i

The evaporator assembly 96 is enclosed within an insulated casingelement which completely surroundsand is spaced from the coils 86. Eachof the coil sections 49, 4| and B0 is positioned in a horizontal planeand supports light weight sheet. metal plates 91 which are constructedof material having an appreciable heat conductivity. The outer edges ofthe plates 91 are turned down as at 98 and are suitably secured to theyinner wall of the casing 95. The rear ends of the plates 91 resting uponthe coil sections 49 and 4| are turned upwardly as indicated at 99 inorder to form a rear .stop for the ice freezing trays I00. Theupperplate 91 resting upon the coil 8|] is adapted to receive andsupporta refrigerator drawer |0| adapted for the refrigeration offoodstuffs, such as meat and the like which require low temperaturecooling for safekeeping. The plates 97 terminate short of the rear wallof chamber 95 and the gas and liquid conduits 43', 44'; 5|',and 52,respectively, are arranged rearwardly of the rear edges of plates 91.

'I'hefront wall of the chamber 95 is closed by a suitable hinged doorelement I02. The space betweenthetop Wall of the casing 95 and the topwall of the chamber 92 is hidden in the front by a plate I93. A controlmechanism I04 ismounted onthe top wall of the casing 95 bo hind theplate I93 and an adjusting knob I05 positively propelled in theevaporator. facture or installation as may be met in ordinary fo-r'thecontrol mechanism is positioned on the front wall-of the plate I53.

The laterally projecting enlarged diameter sinuous box-cooling conduit'85 is provided with a plurality of'cooling fins ii 53 which extendacross that portion of the upper part of the chamber 92 not occupied bythe freezing chamber 95 and y are sloped on their bottom edge asindicated at i H in order to drain condensate to the end thereofadjacentthe casing 95. A suitabl drip trough 'l 12 is positioned on theouter side wall of the casing 95 and underlies the lower end of the finsHi. This trough H2 may drain into a suitable "receptacle, not shown,positioned along the rear wall of the cabinet Stor it may be providedwith an exterior drain as desired.

A suitable shelf H5 is positioned in the upper portion of the cabinetbeneath the level of the chamber t5 and is provided with a depressedportion I it which receives a drip tray ill underlying the freezingchamber 95. A suitable conduit H3 is arranged to drain the trough H2into the receptacle H'i.

Due to the fact that the liquid refrigerant is through the evaporator bythe inert gas except in the drain conduits in which liquid falls througha substantially vertical path, the liquid is circulated by the positivepropulsionof the gas and inaccuracies in manufacture and in installationof the apparatus do not cause the liquid to collect at a particularpoint or points in the evaporator, to interfere with the gas flow or tohe unequally distributed Such inequalities in manupractice will ofcourse not be-of sufficient magnitude to affect the circulation of theliquid through the rather steeply sloped conduit 85 or through the drainconduits in connecting with various adjacent vertical levels in theevaporator.

It is particularly characteristic of this invention that theffree'zingcoils may-he positioned in a horizontal plane wherefore the same maydirectly underlie and he in direct and intimate heat transferrelationship with the ice freezing tray; This is a marked'stepforwarder/er the previous-constructions in which the slope of the"conduits this substantially impossible.

The present evaporator construction also lends itself readily to thetwo-temperature arrangement-shown in Figures Band '7 in which the icefreezing and air cooling sections of the evaporator are thermallysegregated. Due toth'e fact that thelean gas flows first through the icefreezing evaporator the gas supplied to these air cooling from the airinthe-compartment-SZ, and do not exert an undue drying efiec-t uponfoodstuffs stored in the apparatus.

It is further of considerable importance that the ice freezing and 'lowtemperature refrigerating evaporator sections are positioned indirectand intimate heat transfer relationship with the ice trays and lowtemperature freezing drawer and are thermally very remote from the airwithin the food storage compartment. This insures a high efficiency anda high speed of refrigeration within the compartment 95 Withoutproducing deleterious eifects Within the compartment 92.

Due to the relatively high temperature at which the conduit 85 operatesfrost will not be collected on that conduit and its associated fins HQ.However, some moisture Willbe condensed upon thefins 1 H) which willthen drain into the trough-l t2 and from there through the conduit H8,into the drip tray H"! from which it may be disposed to a point ofultimate disposal from time to time.

It is characteristic of all the above described forms of the inventionthat the refrigerating effect is produced solely in the horizontalevaporator conduits. Refrigeration isnot produced in the gas conduitsconveying inert gas upwardly between super-posed horizontalrefrigerating coils or in the liquid conduits conveying liquidrefrigerant downwardly between superposed horizontal refrigeratingcoils. Therefore, the refrigerating effect is concentrated beneath thechilling receptacles where it will 'do the most good. 7

The evaporators disclosed in all the figures may be arranged in acabinet generally in the manner illustrated in Figures 6. and '7, thoughthe evaporator of Figure 5 is particularly well adapted for thatpurpose. If an evaporator, such as that shown in Figure 2, were embodiedin a cabinet the freezing chamber would be centrally positioned in theupper portion of the storage chamber of the cabinet and the box coolingelement would directly overlie the evaporating element.

The evaporators above described are very efficient in that the liquid ispropelled through the evaporating zones thereof by the inert gas stream.This relatesv the rates of flow of gas and liquid in the evaporator andalso causes the liquid to :be agitated thereby increasing the effectivearea of gas and liquid contact.

The inert gas positively drags or sweeps the liquid refrigerant throughthe gas and liquid contact conduits though the volume of gas circulatingthrough the evaporator is several hundredtimes the volume of refrigerantsupplied thereto per unit of time. Consequently, the velocity of the gasisrnuch greater than the velocity of the liquid in the evaporator. Thislarge discrepancyin volumes is advantageous in order to evaporate theliquid refrigerant efficiently and to produce temperatures gradientdesirable for freezing ice and preserving foodstuffs.

The propelling power of the inert gas is a function of its density,pressure, and velocity of flow. In general, an increase in any one ormore of these factors. increases the propelling power of the gas stream.For example, ithas been found that liquid ammonia will be propelledthrough an evaporator conduit of approximately one-half inch internaldiameter by apropelled stream of nitrogen into which the refrigerant isevaporating with thesystem pressure ranging between 270 and 400 poundsper square inch and a pressure differential across the gas inlet andoutlet connections to the evaporator of approximately two to fourinches-of water. These dimensionsare cited by way of example only, andthey are not limiting in any sense.

The inert gas flows through'the evaporator conduits in a stream whichpropels "a stream of the liquidalong the bottom of the conduit by thefrictional drag between the liquidiand the high velocity stream of gas.The liquid is also agitated While I have illustrated and described a fewembodiments of my invention this is not to be taken in a limiting sense,but it is to be understood that my invention is capable 0f embodi mentin, numerous constructional forms without departingffrom the spirit ofthe invention orthe scope of the appended claims. "Iclaim: e 1.Refrigerating apparatus comprising an evaporator, said evaporatorincludinga lower sec-- tion and a finned upper box-cooling sectionserially'connected together, means for supplying a propelled stream ofinert, gas to thelower portion of said evaporator to flow upwardlytherein, means for supplyingliquid refrigerant to said box-cooling coil,means fordraining liquidrefrig erant from said box-cooling coil to saidlower section, the arrangement being such that the liquid flows incounterflow, relationship to said inert gas stream in said box-coolingcoil and in parallel relationship with said inert gas at all points ofgas and liquid contact insaid lower section. o 2.Refriger'atingapparatus including a pressure equalizingvmedium circuit having anabsorber and an evaporator therein, said evapo rator comprising alowersection and an upper box-cooling section serially connectedtogether, a condenser extending below, said box-cooling section, meansfor conveying, liquid refrigerant fromsaid condenser to the upperportion of said lowersection, means forfpropelling a pressure equalizingmedium through said circuit, said circuit being arrangedtocause pressureequalizing medium to flow upwardly through said evaporator, a gas liftpumpinterconnecting the top portion of said lower evaporator section andsaid box-cooling coil, and meansdivertingaportion of, the inert gasunder pressure from said propelling means directlyintjosaid gas liftpump.

3. Refrigeratin apparatus including an evaporator having an upperbox-cooling section'and a lower coil section comprising a series ofvertically 'spacedserially connected coil elements, a condenserextending below said box-cooling coil and connectedto dischargerefrigerantinto the highest of said coil sections, means forsupplying apropelled stream of inert gas underpre'ssure to the lowest portions ofsaid evaporator, means operated by a propelled stream of said inert gasunder, pressure operable to elevate liquid refrigerant from said coilsection into said box-cooling coil, and said evaporator including meansarranged. to drain liquid refrigerant downwardly therethrough from levelto level therein and out of contact with said inert gas stream.

4. Refrigerating apparatus comprising, an. evaporator, said evaporatorincluding a plurality of vertically spaced serially connected sections,means ,for. supplying inert gas under pressure to the lowest portionsof. said evaporator, acon-.

denserextending below, the top portion of said evaporator andfconnectedto discharge liquid ris jt t n int m i te Po ti ther of.

thatterm is lused in a relative,

for example, in the particular tion which includes thesteps ofpropelling a. pressure equalizing medium through a circuit includinganevaporating zone, supplying liquid, refrigerant to said evaporatingzone, propelling liquid through portions of said evaporating zone by thefrictional drag of the pressure equalizing medium flowing through suchzone and elevating liquid refrigerant between; portions of said evap-,

crating zone by introducingpressure equalizing medium supplied from saidcircuit into the liquid to elevatethe same by gas lift action. 6.Absorption refrigerating apparatus comprising a solution circuitincluding a boiler and an absorber, an inert gas circuit including anevaporatorand said absorber, means forliquefying refrigerant generatedin said boiler and for supplying the same'to said evaporator, means insaid inert gas circuit for circulating the inert gas through saidevaporator with a velocity suflicient to sweep or drag the refrigerant,through said evaporator as it is evaporating into the inert gas toproduce refrigeration.

7. Absorption refrigerating apparatus comprising a solution circuitincluding a boiler anclan absorber, an inert gas circuit including'anevaporator'and said'absorber, said evaporator including: a plurality ofsections positioned at different elerating into the inert gas toproduce, refrigeration.

o 8. Absorptionrefrigerating apparatus compris-; ing a solution circuitincluding a boiler and an absorber, an inert gas circuit including anevaporator and said absorber, said evaporator including a plurality ofsections positioned at different elevations, means for liquefyingrefrigerant generated in said boiler and for supplying the sametotheupper portion of said evaporaton means in said inert gas circuitforcirculating the inert gas through said evaporator with a velocitysufficient to sweep 'or drag the refrigerant through said evaporator asit isevaporating into the inert gas to produce refrigeration.

, 9. Absorption refrigerating apparatus come prising a solution circuitincluding a boiler and an absorber, an inert gas circuit including anevaporator and said absorber, said evaporator including a plurality ofsections positioned at different elevations, means for. liquefyingrefrigerant generated in said ,boiler and for supplying the same to theupper portion of said evaporator, means in said inert gas circuit forcirculating the inert gas through said evaporator with a velocitysufficient to sweep or drag the refrigerant through said evaporator asit is evaporating into the inert gas to produce refrigeration, and meansfor draining unevaporated liquid from each section, of said evaporatorto the next lowestsection thereof and out of contact withthe inert gas.

10. Absorption refrigerating apparatus comprising a solutioncircuitincluding a boiler and" an absorber, an inert {gas circuit including, anevaporator and said absorber, said evaporator including a plurality ofsections positioned at dif-v ferent. elevationajmeans for liquefyingrefrigerant generated in said boiler and for supplying the same" tothe-upper part of said evaporator, means in said'inertgas circuitiorcirculatingthe inert gas upwardly through said evaporator. with avelocity sufficient to sweep" or drag the refrigerant through'saidevaporator" as it is evaporating into the inert gas to producerefrigeration, and 'means for draining unevaporated' liquid from eachsection of said evaporator to a'lower sectionthereof out of contact withinert gas, whereby the gas and liquid'fiowln parallel relationshipthrough said sections individually and in counterfiow relationshipthrough said sections as a group."

l1. Absorption refrigerating apparatus comprising a solution circuitincluding a boiler and an absorber, an inert gas circuit including anevaporator and "said absorber, means for lique iyingreirigerantgenerated in said boiler and for supplyingthe same to s'aidevaporator,said evaporator including a substantially horizontal conduit having arelatively small cross-sectional area, and means in said inert gascircuit for propelling the inert gas through said conduit underconditions such that the refrigerant is carried through such conduit bythe inert gas into which it is evaporating to produce refrig" oration, I

12. Absorption refrigerating apparatus comprising a solution circuitincluding a boiler and an absorber, an inert gas circuit including anevaporator and said absorber, means for liquefyw ing refrigerantgenerated'in said boiler and for supplying the same to said evaporator,said evaporator comprising a plurality of substantially horizontalsuperposed serially connected shelf-like coil sections, and means insaidinert gas circuit for propelling the inert gas through I each of saidsections under conditions such that the refrigerant is carried throughsuch section by the inert gas into which it is evaporating to producerefrigeration.

13. Absorption refrigerating apparatus comprising a solution circuitincluding a boiler and an absorber, an inert gas circuit including anevaporator and said absorber, means for liquefying refrigerant generatedin said boiler and for supplying the same to said evaporator, saidevaporator including a substantially horizontal conduit having arelatively smallcross-sectional area, means in said inert gas circuitfor propelling the inert gas through said conduit under conditions suchthat the refrigerant is carried through such conduit by the inert gasinto which it is evaporating to produce, refrigeration, an

upper finned large diameter box-cooling conduit through which inert gasand refrigerant flow in opposite, directions connected to saidhorizontal conduit, and means for conveying unevaporated material fromsaid box-cooling conduit into said horizontal conduit; v

14. That improvement in the art' of absorption refrigerationwhich'includes the steps of applying heat to a solution of arefrigerant'and an absorbent to liberate refrigerant vapor therefrom,conveying the resultant liquid refrigerant into an evaporating zonehavinga plurality of sections, flowing the refrigerant liquid througheach of such sections by the frictional drag of an inert gas flowingthereover, conveying the inert gas and unevaporated liquid refrigerantbetween sections out of contact with each other and in oppositedirections, flowing the resultant mixture of 'ine-rt gas andrefrigerantvapor into intimatecontact with solution previouslyweakenediinirefrigerant-vapor content by the applie e Qfh at her m: V l

Refrigerating apparatus including 7 an evaporatorhavinga piuralityofsections, means for; circulating "anjinert gas'through said. evaporatorinone directionwith a velocity sufficient to -propel liquid refrigeranttherethrough by the frictional drag exertedjon' the liquid bythe inertgas, means for supplyinga refrigerant liquid to said evaporator forcirculation therethrough in another direction; and means-for conveyingliquid refrigerantlfrom one section of said evaporator toanother sectionthereof by gravity and out "of contact with the inert gas and in adirection generally counter to the direction 'of flow of the inert gasthrough said evaporator.

16; Absorption refrigerating apparatus comprising arr absorber an d anevaporator connected to form an inert gas circuit,a'boiler connected tosaid absorber toform a solutioncircuit", means for liquefyingrefrigerant vapor produced in said boiler and for supplyingthe same tosaid evap orator, ;meanst for" circulating the inert gas through said;evaporator" under conditions such that the liquid refrig'erant' ispropelled therethrough by-the' inertgas as it is evaporating into theiriertt gasya gas lift-pump included in said solution circuit; andmeansfor supplying pumpinggas thereto. V

lZfAii absorption refrigerating system 'comprising an evaporatorelem'entand an absorber element connected for circulation .of "an inert gastherebetwe'en, means for supplying 'a refrigerant liquid to saidevaporator element, means for supplying an absorption liquid to saidabsorber element," one of said elements including a plurality ofsections, means for conveying liquid from one section to another'sectionthereof'out of contact withtheine'rt gas and'in a direction generallycounter to the direction ofinert gas flow through saidonee1ement',andrnea ns for forcing the inert gas through said one elementwith a"ve' locitysufficientto drag the liquid; refrigerant in thedirection of flow of the inert gas independently of the forceofgravity.

18; That'irnprovernentl in the ,art of 7 absorption refrigeration whichincludes the steps of 0111011", lating'an absorbing solution between anabsorbing' zone in which refrigerant is added to the solution bycontacting the same with a mixture of a pressure equalizing medium andrefrigerant vapor and a generating zone in which refrigerant vapor isremoved'froin the solution by the application of heat thereto, passingthe vapor pro-j duced in the'generating zone in heat exchange withcooling air to convert the vapor to liquid, supplying'said liquid to'anevaporating zone, circulating the pressure equalizing medium rcfrigerantvapor'mixture through the absorbing zone and through the evaporatingzone under conditions such that the liquid is distributed through theevaporating zone as it is evaporating into the pressure equalizingmedium by the frictional drag exerted thereon by the pressure equalizingmedium refrigerant vapor mixture flowing through such zone.

19. An absorptionrefrigerating system comrsssiiehsi l nneqied fetter-c tn 'se h re throughand means for'conveyin'g liquidfrom=- ment, a r 22.Absorption refrigeration apparatus co mone of saidsectionsto anotherv ofsaid sections outof contactwiththe gas flowing through said sections ina directioncounter to the general (direction ofqgas, flow through saidsections, and

means'jfor propelling the inert as through said sections withfa velocitysuflicient to propel the liquid therethrough by the (frictional drag ofthe inert gas whereby the gas and liquid flow through said one elementas a whole, in opposite directions and flow in the same direction at allpoints of gas and liquid contact. l 20. That v improvement in orationsystems of the type involving the expulsion of refrigerant vaporzfromsolutionjin an absorbing liquid, conversion lof the vapor to the liquidstate,evaporation of therefrigerant liquid into an inert, gas in anevaporation zone and absorption of the refrigerant into absorbingliquidin an} absorbing zone which includes the steps of propelling the inertgas throughone of said zones with a velocity sufficient topropeltheliquid therethrough by the friotionalldrag .of-the gas streamflowing thereby. a a i i 21; Absorption refrigeratingapparatuscomprisingagenerator, a condenser connected to receiverefrigerant vapor from saidfgenerator, Ian evaporator-including anelement forming asunobstructed elongated passageway, means forsupplyingliquid refrigerant from saidscondenser to said element, anabsorber connected to said evaporator and to said generator to forminert gas and absorption solution circuits respectively, means insaidinert gas circuit for forcing inert gas to flow through saidp-assageway witha velocity sufficient to circulate liquid refrigeranttherethrough by the frictional drag of the inert gas whereby the highvelocity gas stream substantially continuously scrubs the innern wall ofsaid element to provide good heat transfer relationship between theinert gasand said eleprising'an; element in which an'inert gasxisbrought into contact with a, liquid to effect a transfer of refrigerantvapor between the liquid and the gas which is accompanied by'a transferof heat through said element between the liquid and gas and the mediumsurrounding said ele-- 23. Aflrefrigerating system including a pressureequalizing medium circuit having an absorber and an upstandingevaporator therein,a

solution circuit having a generator and said lab sorber therein arrangedforgravity; flow (of solution thro hfi dabsorber, said evaporator andabsorber being so arranged in said pressure equalizingme'dium circuitthat the pressure equalizing medium flows upwardly therethrough, meansfor generator and for supplying the liquid to the absorption refrie'evaporator under conditions such that the liquid refrigerant iscirculated by the impetusimparted thereto by the pressureequalizingmedium, means arranged to withdraw refrigerant liquid from one portionof said evaporator and to return the liquid to said evaporator at alower elevation, said means being so arranged with respect to the flowof pressure equalizing medium through said evaporator that the liquidand pressure equalizingmedium flow in the same direction when they arein contact and m in opposite direc-v tions through the evaporator as a;wholewhereby ,the downwardly flowing liquid isfrernoved from contactwith pressure'equalizing medium of a certain refrigerant vapor contentand is conveyed into contactwith pressure equalizing medium of a lowerrefrigerant vapor content.

24. An evaporator for, use in three fluid absorption refrigeratingmachines comprising means forming an elongated gas and liquidevaporating passageway having a plurality of vartically spaced seriallyconnected substantially horizontal sinuous 'sectionsadapted to underlieand refrigerate ice trays, means providing for the supply of an inertgas to said evaporating passageway, means providing for the supply orarefrigerant liquid to said evaporatingfpassageway, means providing forthe removal of inert gas and refrigerant vapor from said evaporatingpassageway, means for removingnon-gase'ous matter from said passageway,and means providing for ilow of inert gas and refrigerant liquid betweenadjacent, horizontal sections of said evaporator and out of contact witheach other.

25. Inanabsorption refrigerating apparatus a generator, an absorber, .acondenser, an evaporator, means providing for circulation of absorptionsolutionbetween said generatorand said absorber, means-for conductingrefrigerant vapor from saidgeneratorto said condenser,

means for conducting refrigerant liquidfrom said condenser to saidevaporator, said evaporator in- V cludinga substantially. horizontalsection jarranged -to refrigerate an ice tray, and means providing forcirculation of an inert gasbetwepen said evaporator and said absorber,said apparatus being so constructedand arranged that the refrigerantliquid circulated through said horizontal section of said evaporatorbythe inert gas;

'26. Absorption refrigerating apparatus C0111}? prising, a generator acondenser, an. evaporator including a substantially horizontal sinuouspassageway,-an absorber, means providing ,for the circulationof; anabsorption solution between said I absorber and saidgenerator, means forconducting refrigerant vapor from said generator to said condenser,means for conducting refrigerant li- Vquidkfromj said condenser to saidevaporaton a V shelflying upon said evaporator passageway and in directheat transfer relationship therewith, an ice' trayrestingupon said shelfdirectlyabove saidpassageway, means providing for circulation Jliquefying'refrigerazit vaper produced in i said upper portionofisaidevlaporator, means in said Pressure e ua i 'me um ii.. P rP inthe pressure; equalizing medium throughl sald of inert gas between said.evaporator and Isaid absorber, saidpassagew ay being so constructed andarranged that the liquid refrigerant is circulated through saidpassageway by 'the inert gas,

and a casing enclosing said coil, plate and tray.

H '27 In combination a threeffl uid absorptionree frigerating apparatusincluding agenerator and an absorber connected for circulation 'of'absorption; solution, an evaporator and said absorber connected foreirculation of inert gas, means for liquefyinglgrefrigerant vaporproduced by said generator, means for conducting"refrigerant lltioned invertically spaced relationship,

conducting refrigerant liquid from said liquefyiing means forming means,and means" horizontal passageways in quid from said liquefying meanstds'aid evaporato'r, said evaporator comprising a plurality ofvertically spaced serially, connected substantially horizontal sinuousconduits and a finned sinuous conduit positioned laterally of said firstmentioned sinuous conduits and serially connected thereto, and saidevaporator being so constructed and'arranged that the inert gas andliquid refrig erant' flow in counterflow relationship in'said finned'cdnduit' and the liquid refrigerant is cireculated through saidsubstantially horizontal condui'ts by the inert gas. H

T28, Absorption"refrigerating apparatus come prising a cabinet structureincluding an insulated I refrigerating chamber, an insulated freezingcompartment positioned in theupper portion of said chamberfan'evaporator having a low temperature freezing portion in said compartmentand a finned air cooling portion positioned laterlallyofsaid"compartment'in said chamber, said low temperature portion'of saidevaporator inmusings plurality of horizontal gas and liquid passagewayformingmeans adapted to underlie and refrigeratefreezingjreceptacles andarranged out of heat conducting relationship with the exterior walls ofsaid compartment, means for" producing liquid'refrigerant and forsupplying the "liquid to said finned portion of said evaporator, meansfor conducting liquid refrigerant from said finned portion of saidevaporator to the low temperature portion of said evaporator, means forcirculatingan' inert gas upwardly through the'low temperature portion ofsaid evaporator withsufficient velocity-and crating apparatuscomabsorption solution between said generator and said absorber; meansproviding for circulation of inert gas between said absorber and saidevaporator, means for liquefying refrigerant vapor produced in 'saidgene'rator, said evaporator including a plurality of substantiallyhorizontal shelf-hire gas and liquid passageway forming means posimeansfor to said evaporator, means for conducting refrigerant liquid fromeach of said passagefway forming means afterthe liquid has passedtherethrou'gh to a lower one of said passageway as between saidpassageway forming means out of contact with liquid refrigerant,,wherebysa d liquid refrigerant and inertgas-flow through said contact witheach. other to produce a refrigerating effect and no refrigeratingeffect is produced between said horizontal passageway forming means.

, 30.' Absorption refrigerating apparatus comprising a cabinetstructureincluding aninsulated refrigerating chamber and an aincooled mechanismchamber, an absorption refrigerating appa ratus associated with saidcabinet structure ingenerato-r; a condenser,

for conducting inert means providing for circulation of absorption 50-lution between said generator'and said absorber,-

mean providing for circulation of inert gas between said evaporator andsaid absorber, means for conducting refrigerant vapor from saidgeneratorto'said condenser, said evaporator including a plurality of sinuoussubstantially horizontal conduitsjpositioned in vertically spacedrelationship, shelf elements overlying and inheat transfer relationshipwith saidconduits, means for conducting liquid refrigerant from saidcondenser to the highest of said conduits, means for drainingrefrigerant'liquid' that has passed through each conduit to a lowerconduit and out of contact with inert gas, means for conducting. inertgas between said conduits out of contact with liquid refrigerant, andmeans for removing unevaporated material from the lowest of saidconduits, the construction and arrangement being such that theevaporation of refrigerant is confined to areas of said evaporatordirectly underlying said shelf lements.

31. Absorption refrigerating apparatus including a generator, acondenser, an absorber, an evaporator including a plurality ofsubstantially horizontal evaporator passageways, means providing for thecirculation of absorption solution between said generator and saidabsorber, means providing for the circulation of inert gas between saidgenerator and said evaporator, means for conducting refrigerant vaporfrom said generator to said condenser and for conducting refrigerantliquid from said condenser to said evaporator, a plurality of ice trayresting upon said evaporator passageways, and an evaporator casingcompletely enclosing said passageways and said trays, said apparatusbeing so constructed and arranged that the liquid refrigerant iscirculated through said passageways by the inert gas.

32. Absorption refrigerating apparatus comprising a cabinet structurincluding an insulated refrigerating chamber and an air cooled mechanismchamber, an absorption refrigerating apparatus associated with saidcabinet structure including an evaporator in said refrigerating chamber,an absorber in said mechanism chamber, a generator in said mechanismchamber, an air cooled condenser in said mechanism chamber,

eluding an evaporator. in said refrigeratin cham- I ber, an'absorberinsaid mechanism chamber, a generator in said mechanism chamber, an aircooled condenser in said mechanism chamber,

each conduit to alower' conduit and'out of contact with inert gas, meansfor conductin inert gas between said conduits .out'of 'contact withliquid refrigerant, means for removing unevaporated material from thelowest of said conduits, and a casing enclosing said evaporator, saidshelves and said gas andliquid' conducting means, said shelf elementsterminating short of the rear [wall of said casing and said gasandliquid conducting means being arranged "rearwardly of said shelfelements, the construction and arrangement being such that theevaporation of refrig- 'erant is confined to areas of said evaporatordirectly'underlying said'shelf elements.

33. Absorption refrigerating apparatus including a generator, acondenser, an absorber, an evaporator including a plurality ofsubstantially horizontal sinuous evaporator conduits positioned inVertically spaced relationship and serially connected by upstandingconduits, means providing for the circulation of absorption solutionbetween said generator and said absorber, means provid- 1 mg for thecirculation of inert gas between said generator and said'evaporator,means for conducting refrigerant vapor from said generator to saidcondenser and for conducting refrigerant liquid from said condenser tosaid evaporator, a plurality of ice trays resting upon said sinuousconduits, and an evaporator casing completely inclosing said conduitsand said tray, said apparatus being so constructed and arranged that theliquid refrigerant is circulated through said horizontally positionedsinuous conduits by theinert as.

, 34; Absorption refrigerating apparatus com prising a cabinet structureincluding an insulated refrigerating chamber and an air cooled mechanismchamber, an absorption refrigerating apparatus associated with saidcabinet structureineluding an evaporatorin said refrigerating chamber,an absorber in said mechanism chamber, a generator in said mechanismchamber, an air cooled condenser in saidmechanism chamber, meansproviding for circulation of absorption solution between said generatorand said ab- 1 sorber, means providing for circulation of inert gasbetween said evaporator and said absorber,

, means for conducting refrigerant vapor from said generator to saidcondenser, said evaporator including an elongated horizontalconduit ofsmall diameter arranged to form a shelf -like coil, an ice traysupporting shelf lying on said coil, means for conducting refrigerantliquid from said condenser to said coil, said apparatus being soconstructed and arranged thatv the liquid refrigerant is circulatedthrough said, elongated conduit by the inert gas.

35. Absorption refrigerating apparatus comprising a cabinet structureincluding an insulated refrigerating chamber and an air cooled mechanismchamber, an absorption refrigerating apparatus associated with saidcabinet structure including an evaporator in said refrigerating chamber,an absorber in said mechanism chamber, a generator in said mechanismchamber, an air cooled condenser in said mechanism chamber, meansproviding for circulation of absorption solution between said generatorand said absorber, means providing for circulation of inert gas betweensaid evaporator and said absorber, means for conducting refrigerantvapor from said generator to said condensensaid evaporator including afreezing section and a sinuous air cooling conduit positioned laterallyof said freezing section, said freezing section being positioned in the.upper portion of said refrigerating chamber, an

insulated housing around said freezing section, a plurality of finsthermally bonded to said sinuous conduit, said fins being so constructedand arranged that their lower edges slope downwardly toward andterminate closely adjacent to a wall of saidhousing, and a drip troughon the wall of said housing underlying the lower ends of said fins. I

' CURTIS C. COONS.

